Method for circulating and maintaining drilling mud in a wellbore
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United States of America Patent
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-
Mar 31, 1987
Grant Date -
N/A
app pub date -
Dec 5, 1985
filing date -
Dec 5, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for circulating and maintaining a drilling mud in a wellbore drilled into a subterranean formation at a desired pressure during drilling operations, said method consisting essentially of; (a) circulating drilling mud through a drill pipe in the wellbore into the wellbore, maintaining a desired pressure in said wellbore and recovering drilling mud from the wellbore at a controlled rate using a mud pump and mud pit arrangement; and, (b) maintaining a second supply of drilling mud in fluid communication with the drill pipe at a suitable pressure so that when the mud pump fails to maintain pressure in the drill pipe, drilling mud is supplied from the second supply of drilling mud to maintain pressure in the wellbore.
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